a=[]
b=input()
for i in b:
    if i=="(":
        a.append(i)
    if i==")" and len(a)>0 and a[-1]=="(":
        a.pop() 
    if i=="[":
        a.append(i)
    if i=="]" and len(a)>0 and a[-1]=="[":
        a.pop() 
    if i=="{":
        a.append(i)
    if i=="}" and len(a)>0 and a[-1]=="{":
        a.pop()     
        
    if i=="<":
        a.append(i)
    if i==">" and len(a)>0 and a[-1]=="<":
        a.pop() 
if len (a)==0:
    print("Верная")
elif len(a)!=0:
    print("Неверная")
    